system/libucontext: update URL, fix x86_64 crash

system/libucontext/0001-Reorder-registers-in-other-assembler-files.patch

+From 42c84cbe58c3c9089cc2a46a425210f20b47bcc9 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Thu, 19 Jul 2018 17:17:26 -0500
+Subject: [PATCH] Reorder registers in other assembler files
+
+This fixes the previous commit which changed the register order in
+swapcontext only, which caused setcontext to subtly corrupt the stack.
+---
+ arch/x86_64/getcontext.S | 4 ++--
+ arch/x86_64/setcontext.S | 4 ++--
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/arch/x86_64/getcontext.S b/arch/x86_64/getcontext.S
+index 7e56a1a..24cc1d3 100644
+--- a/arch/x86_64/getcontext.S
++++ b/arch/x86_64/getcontext.S
+@@ -22,8 +22,8 @@ __getcontext:
+ 	movq	%r14, 88(%rdi)
+ 	movq	%r15, 96(%rdi)
+ 	movq	%rdi, 104(%rdi)
+-	movq	%rbp, 112(%rdi)
+-	movq	%rsi, 120(%rdi)
++	movq	%rsi, 112(%rdi)
++	movq	%rbp, 120(%rdi)
+ 	movq	%rbx, 128(%rdi)
+ 	movq	%rdx, 136(%rdi)
+ 	movq	$1, 144(%rdi)		/* $1 is %rax */
+diff --git a/arch/x86_64/setcontext.S b/arch/x86_64/setcontext.S
+index 607d40c..aba3775 100644
+--- a/arch/x86_64/setcontext.S
++++ b/arch/x86_64/setcontext.S
+@@ -21,8 +21,8 @@ __setcontext:
+ 	movq    80(%rdi), %r13
+ 	movq    88(%rdi), %r14
+ 	movq    96(%rdi), %r15
+-	movq    112(%rdi), %rbp
+-	movq    120(%rdi), %rsi
++	movq    112(%rdi), %rsi
++	movq    120(%rdi), %rbp
+ 	movq    128(%rdi), %rbx
+ 	movq    136(%rdi), %rdx
+ 	movq    144(%rdi), %rax
+-- 
+2.15.0
+

system/libucontext/APKBUILD

 # Maintainer: William Pitcock <nenolod@dereferenced.org>
 pkgname=libucontext
 pkgver=0.1.2
-pkgrel=0
+pkgrel=1
 pkgdesc="ucontext function implementations"
-url="http://github.com/kaniini/libucontext"
+url="https://git.dereferenced.org/kaniini/libucontext/"
 arch="all"
 license="ISC"
 depends=""
 subpackages="$pkgname-dev"
-source="https://distfiles.dereferenced.org/libucontext/libucontext-$pkgver.tar.xz"
+source="https://distfiles.dereferenced.org/libucontext/libucontext-$pkgver.tar.xz
+	0001-Reorder-registers-in-other-assembler-files.patch
+	"
 
 case "$CTARGET_ARCH" in
 armhf)		LIBUCONTEXT_ARCH="arm" ;;
@@ -32,4 +34,5 @@ package() {
 	make ARCH="$LIBUCONTEXT_ARCH" DESTDIR="$pkgdir" install
 }
 
-sha512sums="0c1d74341487d3128667abe9b6594f70c41b4e26bfff656c96eff5de55795f3f4186b3f46281503daf0ee3694a3c10966dd733a6779f49544759a5fe8e6fcdf5  libucontext-0.1.2.tar.xz"
+sha512sums="0c1d74341487d3128667abe9b6594f70c41b4e26bfff656c96eff5de55795f3f4186b3f46281503daf0ee3694a3c10966dd733a6779f49544759a5fe8e6fcdf5  libucontext-0.1.2.tar.xz
+7f3904e5a10db88cfb3e201b0b370c8c04da5ef33fbf9e177a9bc2da5defbe984057c4be1d1e74672b59a9d4978cf0a7233dc3d661c53aeba355ea91d1ebc24b  0001-Reorder-registers-in-other-assembler-files.patch"